notebooks - Operator-Input Form for Lists?

The documentation on Operator-Input Forms shows the following example

which suggests that there is an alternative, convenient, operator-style, tidy technique for inputting lists. However, there is not enough clarity in the example to determine what that technique or operator might be. I tried e11Spacee12 and e11Tabe12, but they both result in Times[e1,e2], somewhat predictably, since space normally denotes multiplication in Mathematica notebooks.

Any ideas whether there is an operator form for inputting lists? What does the documentation mean in this case?

Answer

To input lists, use Ctrl+, which creates two place holders like so:

You can move between them with Tab (forward) and Shift+Tab (backward), but not after you've entered a value. You can create a new column/element with Ctrl+, again and a new row with Ctrl+Enter.

You can use this form anywhere you need a list/matrix:

---

Documentation: Entering Tables and Matrices